Calcining-furnace.



A. CARNI'E. CALCINING FURNACE.

APPLICATION FILED FEB. I3. 1915. L15 3. Patented 0@t.26,1915.

'VE N TOR.

CALCININGr-FUBNACE.

Substitute for application Serial No. 612,532, led March 6, 1911.

Specification of Letters Patent.

Patented ct. 26, 1215.

This application led February 13, 1915.

Serial No. 7,964.

To all whom t may concern.'

Be it known that I, ALEXANDER CARNIE, a subject of Great Britain, residing at North Branch, in the county of Lapeer and State of Michigan, have invented certain new and useful Improvements in Calcining-Furnaces, of which the following is a specification.

My invention relates to improvements in calcining and clinkering furnaces.

lt is particularly adapted for calcining ,claimed the method. herein described.

vIn the accompanying drawing which illustrates the preferred form of my invention, there is shown a vertical sectional view of the apparatus. The calcining and clinkering chamber comprises,.preferably, a vertical stack having an outer casing 1 enveloping a lire brick lining 2, the casing and fire brick being supported upon a base 3. The top of the stack is provided with a cap 4 provided with a central vertical opening in which is iitted the downwardly turned end of a horizontal conductor 5, which is connected to the bottom of a hopper 6 into which are placed the materials4 to be calcined and clinkered and which are to form the cement.

Longitudinally through the conductor 5 extends a rotary shaft 7 provided in said conductor 5 with a feed screw 8 which is adapted when rotated in the proper direction to force the cement materials from the hopper 6 through the conductor 5.

Extending through the stack below the cap 4 is a rotary shaft 9 on which is secured a horizontal drum 10 provided with radial blades 11 located in the stack below the discharge end `of the conductor 5. The drum 10 and blades 11 serve as a rotary device for di'using in the upper part of the stack or calcining chamber, the materials to be ca lclned. The material to be calcined-and clinkered is preferably in a finely powdered form, so that when the materials fall upon the rotary drum 10 they will be diffused and will then fall slowly toward the bottom of the stack.

Any suitable means may be provided for rotating the shaft 9. A shaft 21 has mounted on and rotative withl it a worm 23 which meshes with a worm wheel 24 secured to the shaft 7. Thus by means of the mechanism Just described, when the shaft 21 is rotated the screw 8 will be-rotated. Any means may be provided for rotating the shaft 21.

To calcine and clinker the material while it is falling after its diffusion in the stack 1 provide a burner 25 which extends horizontally through the wall of the stack and has its discharge end extending upwardly centrally in the stack and below the drum 10.

The inlet end of the burner outside of the stack is connected to one end of a horizontal conductor 26, the other end of which is connected to a blower 27 of any suitable type having a horizontal driving shaft'28 which may be rotated by any suitable means.

Mounted on a frame 12 is a bin 32 adapted to contain fuel, such as fine coal or coal-dust. Connected at one of its ends to the lower part of the' bin 32 is a horizontal conductor 33, the other end of which is downwardly turned and is connected to the upper side of the conductor 26. Extending through said conductor 33 and through the lower part of the bin 32 is a horizontal' rotary shaft 34 on which is mounted a feed screw 35, which also extends into the bin 32. When the shaft 34 is turned in the proper direction, the feed screw 35 will force the fuel from the bin 32 into the conductor 26, from which the fuel is blown by the air blast from the blower 27, into and through the burner 25.

To rotate the shaft 34 it has secured to it a worm wheel 36, which meshes with a worm 37 secured to a rotary horizontal shaft 38, which may be rotated by any suitable means.

'llo protect the burner 25 from the heat, it is preferably encircled by a casing 42. Between the casing 42 and burner 25 is a space 43, which is supplied with water by a conductor 44 connected to the lower end of a tank 45, which is mounted on the frame 12 and contains water. Also connected to the casing 42 and communicating with the space 43 isa conductor 46 which is connected to the tank- 45 near the top thereof. By means of the tank 45 and conductors 44 and 46, the space 43 is kept supplied with water. The burner 25 is preferably located between the drum vl0 and the receivin end of a smoke outlet comprising a pipe 4 the lower horizontal end of which is connected to the stack between the base 3 and the burner 25. The vertical portion of the pipe 47 may extend to the height required to effect the proper draft.

The upperJside, of the base 3 is hoppershaped and has mounted in the lower part of its recessed upper side a horizontal rotary shaft 48 which extends through the base 3 and has mounted on it a feed screw 49, which extends into the hopper-shaped depression 50 of the base 3 and through a horizontal discharge opening communi! eating with said depressed portion 50.

In operating my invention, the shafts 21, 38, 48, 28, and 9 are rotated, thereby operating the screws 8, 35 and 49, the blower 27.

and drum 10. The miXed fuel and air discharged from the burner 25 is ignited and the flame resulting therefrom will be blown upwardlyin the stack toward the drum 10. Avdown current will also beformed by the air pressure in theupper part of the stack, thus carrying downward and then outward and upward through the pipe 47 the gaseous products ofcombustion.

vWhen the stack has become sufficiently heated, the material to be calcined and clinkered is placed in the hopper 6 from which itis carried by the screw 8 and discharged into the stack upon the rotating drum l0, the blades of which diffuse the powdered cement materials, which in falling, are calcined and clinkered by the fiame from the burner 25 and are deposited in the form of small nodules or clinkers upon the base 3 and in the depression 50 thereof. The rotating screw 49 carries these nodules or clinkers out through the discharge opening in which is located 'the screw 49. These l nodules are then in convenient formfor the succeeding grinding operation.

y reason of the upward blast from the burner 25, the finely powdered cement ma-A terials are thoroughly commingled and calcined andclin'kered, and, as the calcination and clinkering occurs while the particles are suspended in the air' or gaseous substances in the stack, the cement materials donot form into large masses which would difficult to-break up, but form into nodules or clinkers of small size.

These nodules or clinkers are readily removed from the stack by the screw 49.

I do not limit my invention to the structure illustrated and described, as Various vdiffusing the said modifications, within the scope of the appended claims, may be made without departing from the spirit of my invention.

What I claim is 1. A calcining and clinkering furnace having a calcining and clinkering chamber comprising a 'vertical stack having no outlet near the top and having near the bottom an outlet for smoke and gas, means for discharging into the upper Vpart of the chamber in powdered form the material to be calcined and clinkered, the chamber being adapted to permit the material to fall freely toward the bottom of the chamber, and a burner in said chamber between the outlet and the place of introduction of the material.

2. A calcining and clinkering chamber having no outlet near the top and having near the bottom an outlet for smoke and gas, a conductor discharging into the upper part of said chamber, means for forcing the material to be calcined and clinkered in powdered form through said conductor into said chamber, means in said chamber for material, the chamber bepermit the diffused material to fall freely toward the bottom of the chamber, and a burner in said chamber for calcining and clinkering the material while it is falling.

3. A calcining and clinkering chamber comprising a vertical stack having no outing adapted to let near the top and having a smoke outlet ,said material, the chamber being adapted to permit the diffused material to fall freely toward the bottom of the chamber, a burner in said chamber for heating the material while it is falling, and means for discharging the calcined and clinkered material from the chamber.

4. A calcining and clinkering chamber comprising a stack having no outlet near the top and having a smoke outlet near the bottom, means for carrying into the chamber material to be calcined and clinkered in powdered form and discharging said material near the top of said chamber, means in said chamber for diffusing the said material, the chamber being adapted to permit the diffused material to fall freely toward the bottom of the chamber after diffusion, a burner lfor calcining and clinkering the material while it is falling, the burner being located so as to discharge its flame above the outlet and toward the diffusing means, and means for carrying from the chamber the calcined and clinkered material.

5. A .calcining and clinkering chamber comprismg a vertical stack having no outlet near the top and having near the bottom a smoke outlet, means for feeding into said stack in the upper part thereof material in powdered form to be calcined and clinkered, the chamber being adapted to permit the diffused material to fall freely toward the bottom of the chamber, and means for discharging upwardly in said chamber a fiame in contact with the material while the material is falling.

6. A ca-lcining and clinkering chamber having no outlet near the top and having a smoke outlet near the bottom, means for feeding material to be calcined and elinkered in powdered form into the upper part of the chamber, means for diffusing the material in the chamber, the chamber being adapted to permit the diffused material to fall freely toward the bottom of the chamber, and means for discharging upwardly in the chamber a flame which contacts with. the diffused material while the material is falling.

7. A calcining and clinkering chamber having no outlet near the top and having a smoke outlet near the bottom, means for feeding into the upper part of the chamber material to be calcined and clinkered in powdered fonn, means in the upper part of the chamber for diffusing therein the said material, and means for discharging upwardly in said chamber between said outlet and said diffusing means burning fuel which contacts with the material while it is falling, and-after its diffusion.

8. A calcining and clinkering chamber having no 'outlet near the top and having a smoke outlet near the bottom, means for discharging into the upper lpart of the chamber material to be calcined and elinkered in powdered form, a rotary diffusing device in said chamber near the top thereof, means for discharging upwardly in said chamber between said rotary device and said outlet burning fuel, the chamber being adapted to permit the diffused material to fall freely toward the bottom of the chamber in contact with said burning fuel,'and means for discharging from the chamber the calcined and clinkered material.

n testimony whereof I have signed my name to this specification in presence of two subscribing witnesses.

ALEXANDER CARNIE.

Witnesses:

K. M. BARBOUR, J. A. RAPLEY. 

